#include "apue.h"
#define BUFFSIZE 4096

int main(void)
{
    int n ;
	char buf[BUFFSIZE];

	while((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
		if(write(STDOUT_FILENO, buf , n) !=n)
			err_sys("write error");

	if(n<0)
		err_sys("read error");
	
	exit(0);
}
